1998 BMW 528 very rough idle

Tiny
CJSURVEY
  • MEMBER
  • 1998 BMW 528
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 210,000 MILES
Very rough idle, idles at 100 rpm then 600 rpm then 100 rpm then 600 rpm, then suddenly revs to 5000 rpm and holds there (mysteriously), hard shift in transmission when starting out and when slowing down to a stop in any gear. Fixed most of the vacuum leaks, changed plugs, changed fuel filter. Cleaned dirty idle control valve, new intake gasket,
Runs fairly well, just no smooth idle. I smell gas fumes inside car

having a hard time knowing which hoses are vacuum and being able to see and get to all vacuum lines while running. Also identifying and locating some sensors and or parts. Map sensor, air injection pump, o2 sensors, air temp sensors and so on.

have cleared codes but they come back.
autoray codes
p0173
p1250
p0300
p0306
p0301
p1188
p1189
p0141
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Thursday, November 4th, 2010 AT 2:42 PM

1 Reply

Tiny
DR. HAGERTY
  • MEMBER
What is the history of the car as you know it?
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Monday, November 22nd, 2010 AT 1:09 PM

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